from datetime import datetime as dt
from unittest import SkipTest

from holoviews.core.options import Store
from holoviews.core.spaces import DynamicMap
from holoviews.element import Table
from holoviews.element.comparison import ComparisonTestCase
from holoviews.streams import CDSStream

try:
    from bokeh.models.widgets import (
         NumberEditor, NumberFormatter, DateFormatter,
        DateEditor, StringFormatter, StringEditor, IntEditor
    )
    from holoviews.plotting.bokeh.callbacks import CDSCallback
    from holoviews.plotting.bokeh.renderer import BokehRenderer
    bokeh_renderer = BokehRenderer.instance(mode='server')
except:
    bokeh_renderer = None


class TestBokehTablePlot(ComparisonTestCase):

    def setUp(self):
        self.previous_backend = Store.current_backend
        if not bokeh_renderer:
            raise SkipTest("Bokeh required to test plot instantiation")
        Store.current_backend = 'bokeh'

    def tearDown(self):
        Store.current_backend = self.previous_backend
        bokeh_renderer.last_plot = None

    def test_table_plot(self):
        table = Table(([1, 2, 3], [1., 2., 3.], ['A', 'B', 'C']), ['x', 'y'], 'z')
        plot = bokeh_renderer.get_plot(table)
        dims = table.dimensions()
        formatters = (NumberFormatter, NumberFormatter, StringFormatter)
        editors = (IntEditor, NumberEditor, StringEditor)
        for dim, fmt, edit, column in zip(dims, formatters, editors, plot.state.columns):
            self.assertEqual(column.title, dim.pprint_label)
            self.assertIsInstance(column.formatter, fmt)
            self.assertIsInstance(column.editor, edit)

    def test_table_plot_escaped_dimension(self):
        table = Table([1, 2, 3], ['A Dimension'])
        plot = bokeh_renderer.get_plot(table)
        source = plot.handles['source']
        renderer = plot.handles['glyph_renderer']
        self.assertEqual(list(source.data.keys())[0], renderer.columns[0].field)

    def test_table_plot_datetimes(self):
        table = Table([dt.now(), dt.now()], 'Date')
        plot = bokeh_renderer.get_plot(table)
        column = plot.state.columns[0]
        self.assertEqual(column.title, 'Date')
        self.assertIsInstance(column.formatter, DateFormatter)
        self.assertIsInstance(column.editor, DateEditor)

    def test_table_plot_callback(self):
        table = Table(([1, 2, 3], [1., 2., 3.], ['A', 'B', 'C']), ['x', 'y'], 'z')
        CDSStream(source=table)
        plot = bokeh_renderer.get_plot(table)
        self.assertEqual(len(plot.callbacks), 1)
        self.assertIsInstance(plot.callbacks[0], CDSCallback)

    def test_table_change_columns(self):
        lengths = {'a': 1, 'b': 2, 'c': 3}
        table = DynamicMap(lambda a: Table(range(lengths[a]), a), kdims=['a']).redim.values(a=['a', 'b', 'c'])
        plot = bokeh_renderer.get_plot(table)
        self.assertEqual(sorted(plot.handles['source'].data.keys()), ['a'])
        self.assertEqual(plot.handles['table'].columns[0].title, 'a')
        plot.update(('b',))
        self.assertEqual(sorted(plot.handles['source'].data.keys()), ['b'])
        self.assertEqual(plot.handles['table'].columns[0].title, 'b')
